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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f03aa57261c69519f1ce70218835d735e6e9b6f556657456f2c3a4b71eb34730' 
  AND token = '3C7mHRIR1cB27npmwdogOt1RvLNtcQldh7ExoCuADI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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