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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec1fa0d91b1167c784c19015ec948a1d655daa7436491c205617439a7287723d' 
  AND token = 'Z5BPYLeuLv1B61iADspIi+nRVDiMAKt6RUndMLS037c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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