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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e87bae3fb19775b9409a335cbcd7295a991c702e1f9d4157b0833ee7f387c55f' 
  AND token = '5vgvO3U27c4WX00Osua/f2XTjn1tLHZuG8i+dQUCykE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}