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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56deeec97a83839f78aa7d2ee1bf8b7749dd0e65e6c21712f576530c12c64636' 
  AND token = 'Nu3h+063bWgRoO6sy+5BZL6XpybrHbAdKCWitGaEtfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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