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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8595e5145c631c9ac179d22a2568cebb253f3e24319c0217ce0bee50baaa6a3a' 
  AND token = 'p4RP2sLesfzItkP04DNUnykk7vnakMhGa+oOKt3hJFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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