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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e207a4ad67ded92e3de93455fbf877b86b6d3621dc9be00765eed31a77b2f9bd' 
  AND token = 'HovPx6LeQGWLQSHu5p5yP14WOQSV9xTyQ0og4H19WjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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