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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bfbd332866b5abc369faded26592b2947a5736c1f82647d117b0b795e9a09ff' 
  AND token = 'hYfeqrx/modpscPTJvDDi1/d86FD7XyOmWs15toMkVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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