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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8bed88ebbe69e5946d88bb5a8b21bb549a976d6e524cd01e0c18c5bd2c6d2c0' 
  AND token = 'oDb10MGMxa1YT/TFd7iJZUv9mpezhUTMPPzoEv3tw+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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