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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b947946fb14d5c49e69127829cb0e9d21e082762c83e8b66ba47fc22aa03a1e4' 
  AND token = 'pLUI0qG3Jt2NDbHluArBtaR+q9Y0+EK7eQPJn9rcvxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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