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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a45043da005d01573ca3256513ec79f668f96f55784f29e4095633bdfc107648' 
  AND token = 'NiYKS/w7oQ9FDxHAX78mc+PzdTXmn/KakHpMRf76oEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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