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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96715b4b7acc291de43db0dac813ccfa97ac4b90d6fedf1b2356bf0dd36c0eb6' 
  AND token = '2DITgJ1yNpmSQH8CHW8UEeIy13FDqbE8mCb+Zo0BLKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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