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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8be3a078496dd71dac5a5ebc64b25b6da63cdd5e1c5f4f0eabdd038d6592960e' 
  AND token = 'Yme/Yoe+ZtaeQSBqwz6yrquUEMbDz6jYkqVnNBbiZ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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