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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd78a12f86ec3fdc27606a84fe7f9d8a7e4fa2d0fb62d5aaf2f055ce0f3e1f63e' 
  AND token = 'MIS/DCUwpwWOTlwIJ5rG0eVmtn+hIQzXLPf+9rgmzOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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