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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37811bac3ee94df38c7e226ef492879f9b6397651ecb728733e735f970d25990' 
  AND token = 'ee3nKwvihWDoibgz4DXHfyuh80sRj9b+jQ6QJ3xxJN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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