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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a662ed20b8e0c21bc5e6a9a055a82731c7a33be53727d1e5de36cfcf77e435f9' 
  AND token = 'vXy3r758L1R/siFhnlRyFhBnsZYwZu4hF/bt51ikdJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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