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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0733e514395b59c44ed927c9c544eeb82ca92ea0865ea13493f9f4c6d833acf' 
  AND token = 'b7hM5mLon8HrYEYbtT2TAABVvyxDg3RcLWNgeTZhXyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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