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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a3c4840ab8078d6ffea8bae1ed69ad9355b3f51e4e4cb35b9ad648fc4d8e818' 
  AND token = 'l9HHxucqGoKMr9kH+BXuZalg2fxKSCL7rLVCxgkPaRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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