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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8eab8518d485770f58551298bd39a44624c557c6a27cdf82fca67aac5ccfff7' 
  AND token = '+nJOpsp6c4d2A6SYmiI4zZvx15pvMFonqNn5Z2epgZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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