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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '350ddc38f63403c2eac1a11016f4cf21dfc9f706a64586aed76ce5663eb6b511' 
  AND token = 'n49YSHyAROZkg0z3ZASpNN4r1SpoSGXzwNIn8vazchs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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