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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '648c6bc38b0e2cb0fa44ce5c42bfe6e7487b685ed70262d9ff477a38b5336986' 
  AND token = '33r2GWw5VpYZEOUQwZh6cb3/9ZKWnFWiWWICJpopnXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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