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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '871cdf58c702b0ca1a29fba713bdcc12314478af80422536076b8e489bee6243' 
  AND token = '7ZAJ5qERFvTXniN0upvA+qSoleEEq+JVmOncv4pKomc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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