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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73ee20658bdd81ce8c93e7cf38ea1d7e3fa5dc460e427d7f911bdf9977c619dc' 
  AND token = 'eh0xFvcn8LR2Y9r/KfeyTqBuN3lW0K31tdp5N/efFT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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