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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2754165b9326f5c6e6ffaa28b4c319500c739e1df61e5a1e03211ed1bd0f23ca' 
  AND token = 'vzLQpM5jWUJgibD857zbRsy8EniTfRVPTcZdaoc7er4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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