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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f682128695ba66dd4ff9907d8f4984e43bccc413598829c37dbe14fedb6355' 
  AND token = 'UGQOM5maBDB0WmpRNgxoY4H4Y7V8vDxoSEPpS6J8krQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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