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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a334ecf493720e2af5072434e231e9f4a0d06e213ac34cbd56ec034b6778303' 
  AND token = 'D4lYxqdTMq9EzKQRYoxVQlZNpwQ6+JRHzH5bI42ykn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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