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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f972868e266ca549ba6cfe417903556fc0dee68ab37cea14bd4578b7c3bfb9c' 
  AND token = '8DMoPFEINuSJs8rLAxb3S1OEfPjLUqfs80HAuMUD5qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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