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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e38c68453f95a23b9b06e4ecbe6e5e0864de6c0d95882e52feb178af15712964' 
  AND token = 'CwxeBYYdrP6aJ8lmaEe+Yb6R9SzUkekdXTGrIg+dwrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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