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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47635e82b4cb9ee5cecbb0cf601c1e65e1daf1b6fc93f084eea2638727c0b2d0' 
  AND token = 'LPfa779vuvfFmckgt3vXNLWtrATPkkvay4h9TPI5Jn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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