SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1e61bdaeaa6563403bd3f58b5595494335466267b00ade76321602a1865c031' 
  AND token = 'eBjFnm0GrA79RR6+fXCS7/YBtP5Gp+n0p3tG9vZOJTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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