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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25747726a83ec63e61cac02261133b3ee5c75577f2724ac621996e705a20f5db' 
  AND token = 'ZpxrfFBos2xF6/H6Mj307fpQcnm5SFF0egKU3CcENE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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