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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db7ba8f768807d2c368c56e743145dc42ba2c2e8ba8be019fe7f02bb0debd9b9' 
  AND token = 'rJxtbKxKSJcXQ7F93jKQtMsqfOm7PKevdoljn+GnK6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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