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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a2495eb7b7a5b4e5bf6e93047749b40edf56dde75ed615fafb47ba873a95739' 
  AND token = 'DqmJLgJQFciX6JzL0m7W5NBnbUEOlNrXFeEXtQKNWGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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