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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90362802f1a4e4a2844dcac1b36d6c6c5b39a1b337943b7fb350a393a6a6c068' 
  AND token = 'PsiK4lfwIBdtd0Z6uzdifCanY2k3IFKxfJlU4dcGjpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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