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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd079230388fc5a81c3bdf41785f21ce8ac3fc629d044bf01490d49ac871d3988' 
  AND token = 'RKCgy98y+pmXCDFH0a/6wNTpeM+LWfpit/oQWoaZGOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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