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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1e45cecc99bc2cfbec336d4095d251c994dbdc10e45b55815f59ca9db80fbf9' 
  AND token = 'ln3Og3Sp8f6T1gG9tv4PN4nHSt0qu+HTu8vCH7A9AXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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