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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82ab96cb939b952e60c11b78a2c58955b0561a81eef733013e6de9889e115f09' 
  AND token = 'E0VhFTNP9hPdPrVlROQu6fm1EBq364nb7GPQw1jzGLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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