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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c41038ee93dbe1047cff2989a1329b2c861de8405063023f5e1ddb60516a06b5' 
  AND token = 's8ofN05Z3CbHli+V3ZB9s9Sd0LDWu+s1Z9QITEmjIpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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