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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '806b86eeab8c2eecb3deb9ab6005f9f2fa1de72cd9311018dd197977a9a8be35' 
  AND token = 'gmzcO3w0hAC3oXXb9G/6TjwEf+2cucLGoH6vJ1wz9ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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