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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9ad23509392f5a7e1922fcdf15b434ad970ecf913df3959816f2adaec0c995c' 
  AND token = 'nlXS5diatM53u7HrWzgrBls/ZjJJVbieyl1WIXlSUjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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