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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fe5561cca6585e2aad00c823c99621baf619f6e8f68b9d12c64dcdf0e5aaa73' 
  AND token = 'cRtCOYNUEM52ZL1cKh9nrqlyI9iAKtEWxWWE4+l4DTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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