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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '682a8d47da0253a2e88736289953188fc64864e899b89bc54c448cef028257b9' 
  AND token = 'CC4/Yu95/xU6+xV4RmVmieMqlWH8IsRz5rYpdMZ0QFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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