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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4363c2f8bd386ce1801b1323a83060e3e64f6a7c232ba17d54a021d32ecdef0' 
  AND token = 'e0sGUqmUb4DzAUZQ0XJrVS31rjKCwhSVx4gVZ3p+DrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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