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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae234526a55bc6371f27b79cc11b53e0812384d86eff11161a9870af3799fa57' 
  AND token = 'nMJKTPa1mFe5Q8OSNpIYWSa8Q7VsVBLEgH95kUUljUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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