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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '414ea2662bb8533dcce2afbd6c8f4d340ab0b4f6491a6026b06ffb035c4f814a' 
  AND token = 'My4K28alMGfKQYtXcNHsbwqPk8f7nNU90RYX8FxF/GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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