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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '217e1ec72e07651058427a5e21e5ddd178dca42886d223a4029b1a5ab7caf139' 
  AND token = 'Flve+I1J2t8anFNc9QV+d4AnloECd5/n9IGeBcami48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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