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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22ffc3b6c92cb0aee790e85f4ec682f6b04831181bc65bb894e83519d7c5161c' 
  AND token = '9ZcPnJLzwek9ZjJtnd89oxglpOBEM7LWynL8okT21B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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